New ion-conducting membrane improves alkaline-zinc iron flow batteries

Newly developed ion-conducting membrane improves performance of alkaline-zinc iron flow batteries
Selective ions transport and the hydroxide ions transport in LDHs. Credit: HU Jing

Alkaline zinc-iron flow batteries (AZIFB) are suitable for stationary energy storage applications due to advantages of high open-cell voltage, low cost, and environmental friendliness. However, they suffer from zinc dendrite accumulation and relatively low operation current density.

Recently, a research group led by Prof. Li Xianfeng from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Science (CAS) developed layered double hydroxide (LDH) with high hydroxide conductivity and for alkaline-zinc iron flow batteries.

The study was published in Nature Communications on June 7.

In order to enhance the operating of AZIFB, the researchers added LDHs nano materials into the AZIFB and designed a LDHs-based composite membrane with high performance. High selectivity and superb hydroxide ion conductivity were achieved through the combination of the well-defined interlayer gallery with a strong hydrogen bond network along 2D surfaces.

They identified that surface -OH groups of LDHs layer could assist the conduction of OH- by promoting proton transfer away from one water molecule to the original OH-.

Because of the high ionic conductivity, the LDHs-based membrane enabled the AZIFB to operate at 200 mA cm-2, along with an energy efficiency of 82.36%.

"This study offers a new insight to design and manufacture membranes for AZIFB," said Prof. Li.


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Scientists develop a composite membrane for long-life zinc-based flow batteries

More information: Jing Hu et al, Layered double hydroxide membrane with high hydroxide conductivity and ion selectivity for energy storage device, Nature Communications (2021). DOI: 10.1038/s41467-021-23721-9
Journal information: Nature Communications

Citation: New ion-conducting membrane improves alkaline-zinc iron flow batteries (2021, June 11) retrieved 15 June 2021 from https://phys.org/news/2021-06-ion-conducting-membrane-alkaline-zinc-iron-batteries.html
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